minewebgen - utils.go

     1  package main
     2  
     3  import (
     4  	"archive/zip"
     5  	"io"
     6  	"os"
     7  	"path"
     8  	"syscall"
     9  
    10  	"vimagination.zapto.org/byteio"
    11  	"vimagination.zapto.org/minewebgen/internal/data"
    12  )
    13  
    14  func writeError(w *byteio.StickyLittleEndianWriter, err error) {
    15  	w.WriteUint8(0)
    16  	data.WriteString(w, err.Error())
    17  }
    18  
    19  func moveFile(from, to string) error {
    20  	err := os.Rename(from, to)
    21  	if e, ok := err.(*os.LinkError); !ok || e.Err != syscall.EXDEV {
    22  		return err
    23  	}
    24  	fromf, err := os.Open(from)
    25  	if err != nil {
    26  		return err
    27  	}
    28  	defer fromf.Close()
    29  	tof, err := os.Create(to)
    30  	if err != nil {
    31  		return err
    32  	}
    33  	defer tof.Close()
    34  	_, err = io.Copy(tof, fromf)
    35  	return err
    36  }
    37  
    38  func unzip(zr *zip.Reader, dest string) error {
    39  	for _, f := range zr.File {
    40  		name := path.Join(dest, f.Name)
    41  		if f.FileInfo().IsDir() {
    42  			err := os.MkdirAll(name, f.Mode())
    43  			if err != nil {
    44  				return err
    45  			}
    46  			continue
    47  		}
    48  		inf, err := f.Open()
    49  		if err != nil {
    50  			return err
    51  		}
    52  		of, err := os.OpenFile(name, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, f.Mode())
    53  		if err != nil {
    54  			inf.Close()
    55  			return err
    56  		}
    57  		_, err = io.Copy(of, inf)
    58  		inf.Close()
    59  		of.Close()
    60  		if err != nil {
    61  			return err
    62  		}
    63  	}
    64  	return nil
    65  }